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Chapter 27: Q. 21 (page 722)

How have Hox genes contributed to the diversity of animal body plans?

Short Answer

Expert verified

Hox genes are activated by a series of regulatory genes, and the proteins they encode control the expression of later genes.

Step by step solution

01

Introduction

Hox genes are a subset of animal genes that specifically contain homeobox sequences. The general body plan of an animal, including the number of body segments, the number and location of appendages, and the direction of the animal's head and tail, are all determined by this gene cluster.

02

The explanation for the answer.

The morphology of the individual can significantly change as a result of altered homeotic gene expression. Organ and body component placement can be impacted by hox genes. A fruit fly's limb placement or the spacing between a person's fingers could be altered by a Hox gene mutation or duplication.

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Most popular questions from this chapter

Briefly describe at least two theories that attempt to explain the cause of the Cambrian explosion.

Why might the evolution of specialized tissues be important for animal function and complexity?

Plant life first appeared on land during which of the following periods?

a. Cambrian period

b. Ordovician period

c. Silurian period

d. Devonian period

Which of the following is not possible?

a. radially symmetrical diploblast

b. diploblastic eucoelomate
c. protostomic coelomate

d. bilaterally symmetrical deuterostome

During embryonic development, unique cell layers develop into specific groups of tissues or organs during a stage called ________.

a. the blastula stage

b. the germ layer stage

c. the gastrula stage

d. the organogenesis stage
See all solutions

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